The standby horizon is a completely self-contained unit and is located on the Pilot's center instrument panel. It is powered from the AC standby bus. The cage know may be used to erect the horizon. Flags on the instrument show when the gyro is caged or when power to the device is lost (depending on make or model of the standby horizon). Most standby horizons deployed on the L-1011 had been made by SFENA.
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